.ai-hero {
  position: relative;
  min-height: 690px;
  overflow: hidden;
  background: var(--color-canvas);
}

.ai-hero::before {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(var(--color-line-faint) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-line-faint) 1px, transparent 1px);
  background-size: 44px 44px;
  content: "";
  pointer-events: none;
}

.ai-hero-layout {
  position: relative;
  display: grid;
  min-height: 690px;
  grid-template-columns: minmax(0, 0.92fr) minmax(500px, 1.08fr);
  gap: clamp(28px, 5vw, 78px);
  align-items: center;
  padding-top: 58px;
  padding-bottom: 58px;
}

.ai-hero-copy {
  position: relative;
  z-index: 3;
}

.ai-hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 32px;
  margin-bottom: 24px;
  padding: 0 13px 0 8px;
  border: 1px solid var(--color-dark-faint);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 650;
}

.ai-hero h1 {
  max-width: 600px;
  margin-bottom: 24px;
}

.ai-hero h1 .no-break {
  margin-right: 0.16em;
}

.ai-hero-lead {
  max-width: 640px;
  margin-bottom: 28px;
  color: var(--color-muted);
  font-size: clamp(18px, 1.8vw, 21px);
  line-height: 1.72;
}

.ai-fact-line {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 20px;
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.ai-fact-line span {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.ai-fact-line span::before {
  width: 7px;
  height: 7px;
  margin-right: 8px;
  border-radius: var(--radius-pill);
  background: var(--color-success);
  content: "";
  flex-shrink: 0;
}

.ai-route-device {
  position: relative;
  min-height: 590px;
}

.ai-orbit-label {
  position: absolute;
  top: 12px;
  right: 8px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
}

.ai-orbit-label::before {
  display: inline-block;
  width: 36px;
  margin-right: 10px;
  border-top: 1px dashed var(--color-muted);
  content: "";
  vertical-align: middle;
}

.ai-route-svg {
  width: 100%;
  height: 100%;
  min-height: 590px;
  overflow: visible;
}

.ai-sun {
  fill: var(--color-sun);
}

.ai-orbit {
  fill: none;
  stroke: var(--color-dark-faint);
  stroke-dasharray: 4 10;
  stroke-width: 1.5;
}

.ai-orbit-inner {
  stroke-dasharray: 2 7;
}

.ai-route-line {
  fill: none;
  stroke: var(--color-text);
  stroke-linecap: round;
  stroke-width: 2;
}

.ai-route-line-accent {
  stroke: var(--color-accent-dark);
  stroke-dasharray: 5 7;
}

.ai-model-card,
.ai-mini-card {
  stroke: var(--color-text);
  stroke-width: 2;
}

.ai-model-green {
  fill: var(--color-green-panel);
}

.ai-model-blue {
  fill: var(--color-blue-panel);
}

.ai-mini-card {
  fill: var(--color-white);
}

.ai-core {
  fill: var(--color-panel-deep);
  stroke: var(--color-text);
  stroke-width: 2.5;
}

.ai-model-name {
  fill: var(--color-text);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 760;
  text-anchor: middle;
}

.ai-model-note {
  fill: var(--color-muted);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  text-anchor: middle;
}

.ai-core-brand {
  fill: var(--color-white);
  font-family: var(--font-display);
  font-size: 33px;
  font-weight: 820;
  text-anchor: middle;
}

.ai-core-note {
  fill: var(--color-light-faint);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-anchor: middle;
}

.ai-packet {
  fill: var(--color-accent);
  stroke: var(--color-text);
  stroke-width: 2;
  transform-box: fill-box;
  transform-origin: center;
}

.ai-packet-top {
  animation: ai-packet-top 4.8s ease-in-out infinite;
}

.ai-packet-bottom {
  animation: ai-packet-bottom 4.8s ease-in-out infinite;
}

.ai-base-line {
  fill: none;
  stroke: var(--color-text);
  stroke-linecap: round;
  stroke-width: 3;
}

.ai-article {
  background: var(--color-canvas);
}

.ai-article > .content-wrap {
  padding-top: 32px;
  padding-bottom: 40px;
}

.ai-principle-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
  gap: 16px;
}

.ai-principle {
  position: relative;
  min-height: 280px;
  padding: clamp(25px, 4vw, 38px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-green-panel);
}

.ai-principle-wide {
  min-height: 330px;
}

.ai-principle-blue {
  background: var(--color-blue-panel);
}

.ai-principle-index {
  display: inline-block;
  margin-bottom: 38px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 760;
  letter-spacing: 0.1em;
}

.ai-principle h3 {
  max-width: 540px;
}

.ai-principle p:last-child {
  margin-bottom: 0;
}

.ai-tool-table {
  width: 100%;
  min-width: 850px;
  border-collapse: collapse;
  background: var(--color-white);
}

.ai-tool-table th,
.ai-tool-table td {
  padding: 17px 18px;
  border-bottom: 1px solid var(--color-border-soft);
  text-align: left;
  vertical-align: top;
}

.ai-tool-table th {
  background: var(--color-panel-deep);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 730;
  white-space: nowrap;
}

.ai-tool-table td:first-child {
  font-weight: 780;
  white-space: nowrap;
}

.ai-tool-table tbody tr:nth-child(even) {
  background: var(--color-paper);
}

.ai-tool-table tbody tr:last-child td {
  border-bottom: 0;
}

.ai-split-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(360px, 1fr);
  gap: clamp(30px, 6vw, 86px);
  align-items: end;
  margin-bottom: 46px;
}

.ai-split-heading .section-heading,
.ai-split-heading .lead {
  margin-bottom: 0;
}

.ai-step-list {
  display: grid;
  border-top: 1px solid var(--color-border);
}

.ai-step {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 24px;
  padding-top: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.ai-step-mark {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border: 1px solid var(--color-text);
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-weight: 800;
}

.ai-step h3 {
  margin-bottom: 8px;
}

.ai-step p {
  max-width: 850px;
  margin-bottom: 0;
  color: var(--color-muted);
}

.ai-dark-inner {
  width: 100%;
}

.ai-dark-inner .kicker {
  color: var(--color-sun);
}

.ai-compare {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 70px minmax(0, 1fr);
  align-items: stretch;
}

.ai-compare-panel {
  padding: clamp(26px, 4vw, 42px);
  border-radius: var(--radius-md);
  background: var(--color-green-panel);
  color: var(--color-text);
}

.ai-compare-panel-route {
  background: var(--color-blue-panel);
}

.ai-compare-label {
  display: inline-block;
  margin-bottom: 30px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 760;
  letter-spacing: 0.1em;
}

.ai-compare-panel ul {
  margin: 0;
  padding-left: 1.2em;
}

.ai-compare-panel li {
  margin-bottom: 10px;
}

.ai-compare-axis {
  position: relative;
}

.ai-compare-axis::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  border-left: 1px dashed var(--color-light-faint);
  content: "";
}

.ai-compare-axis span {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12px;
  height: 12px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  transform: translate(-50%, -50%);
}

.ai-dark-note {
  max-width: 820px;
  margin: 32px 0 0;
  color: var(--color-light-faint);
}

.ai-dev-ledger {
  display: grid;
  gap: 18px;
}

.ai-dev-row {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.55fr);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-white);
}

.ai-dev-context,
.ai-dev-route {
  padding: clamp(24px, 4vw, 38px);
}

.ai-dev-context {
  border-right: 1px dashed var(--color-border);
}

.ai-dev-context .badge {
  margin-bottom: 28px;
}

.ai-dev-context p,
.ai-dev-route p {
  margin-bottom: 0;
  color: var(--color-muted);
}

.ai-dev-route {
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--color-blue-panel);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.ai-dev-route strong {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.ai-failure-list {
  display: grid;
  border-top: 1px solid var(--color-border);
}

.ai-choice-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.6fr);
  gap: clamp(32px, 6vw, 86px);
  padding: clamp(30px, 6vw, 70px);
  border: 1px solid var(--color-text);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
}

.ai-choice-copy p {
  max-width: 760px;
}

.ai-choice-copy .button-row {
  margin-top: 30px;
}

.ai-choice-checklist {
  align-self: stretch;
  padding: 28px;
  border-radius: var(--radius-md);
  background: var(--color-panel-deep);
  color: var(--color-white);
}

.ai-choice-checklist strong {
  display: block;
  margin-bottom: 24px;
  color: var(--color-sun);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.ai-choice-checklist ul {
  display: grid;
  gap: 15px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.ai-choice-checklist li {
  position: relative;
  padding-left: 20px;
  color: var(--color-light-faint);
}

.ai-choice-checklist li::before {
  position: absolute;
  left: 0;
  color: var(--color-accent);
  content: "→";
  font-family: var(--font-mono);
  font-weight: 800;
}

.float-cta svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
  flex-shrink: 0;
}

@keyframes ai-packet-top {
  0%,
  15% {
    opacity: 0;
    transform: translateY(0);
  }

  35%,
  70% {
    opacity: 1;
    transform: translateY(72px);
  }

  88%,
  100% {
    opacity: 0;
    transform: translateY(102px);
  }
}

@keyframes ai-packet-bottom {
  0%,
  15% {
    opacity: 0;
    transform: translateY(0);
  }

  35%,
  70% {
    opacity: 1;
    transform: translateY(-72px);
  }

  88%,
  100% {
    opacity: 0;
    transform: translateY(-102px);
  }
}

@media (max-width: 1050px) {
  .ai-hero-layout {
    grid-template-columns: minmax(0, 1fr) minmax(420px, 0.9fr);
  }

  .ai-route-device,
  .ai-route-svg {
    min-height: 520px;
  }

  .ai-principle-grid {
    grid-template-columns: 1fr;
  }

  .ai-principle,
  .ai-principle-wide {
    min-height: 0;
  }

  .ai-choice-panel {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .ai-hero-layout {
    grid-template-columns: 1fr;
    padding-top: 64px;
  }

  .ai-route-device {
    min-height: 570px;
  }

  .ai-route-svg {
    min-height: 570px;
  }

  .ai-orbit-label {
    display: none;
  }

  .ai-split-heading {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .ai-compare {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .ai-compare-axis {
    height: 34px;
  }

  .ai-compare-axis::before {
    top: 50%;
    right: 0;
    bottom: auto;
    left: 0;
    border-top: 1px dashed var(--color-light-faint);
    border-left: 0;
  }

  .ai-dev-row {
    grid-template-columns: 1fr;
  }

  .ai-dev-context {
    border-right: 0;
    border-bottom: 1px dashed var(--color-border);
  }

  .ai-dev-route {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
  }
}

@media (max-width: 640px) {
  .ai-hero {
    min-height: 0;
  }

  .ai-hero-layout {
    min-height: 0;
    padding-top: 46px;
    padding-bottom: 28px;
  }

  .ai-hero-lead {
    font-size: 16px;
  }

  .ai-fact-line {
    display: grid;
    grid-template-columns: 1fr;
  }

  .ai-route-device {
    min-height: 390px;
    margin-top: 8px;
  }

  .ai-route-svg {
    min-height: 390px;
    transform: scale(1.12);
    transform-origin: center;
  }

  .ai-article > .content-wrap {
    padding-top: 20px;
  }

  .ai-principle {
    padding: 22px;
  }

  .ai-principle-index {
    margin-bottom: 24px;
  }

  .ai-step {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .ai-step-mark {
    width: 44px;
    height: 44px;
  }

  .ai-compare-panel {
    padding: 22px;
  }

  .ai-dev-context,
  .ai-dev-route {
    padding: 22px;
  }

  .ai-choice-panel {
    padding: 22px;
    border-radius: var(--radius-md);
  }

  .ai-choice-checklist {
    padding: 22px;
  }

  .float-cta svg {
    display: none;
  }
}